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@ 2017-04-06T10:33:34Z

<?php
header('Content-type: text/plain');
$metaarr = array(
    array(
        "post_id" => '34',
    	"meta_key" => "product_shops_0_price",
    	"meta_value"=> "25"
    ),
    array(
        "post_id" => '34',
    	"meta_key" => "product_shops_0_price_old",
    	"meta_value"=> "45"
    ),
    array(
        "post_id" => '34',
    	"meta_key" => "product_shops_1_price",
    	"meta_value"=> "25"
    ),
    array(
        "post_id" => '34',
    	"meta_key" => "product_shops_1_price_old",
    	"meta_value"=> "45"
    )
	
);
$map = array();
foreach ($metaarr as $key => $value) {
    
	$splarr = preg_match('/^(product_shops_\d*)_(\S*)/', $value['meta_key'], $matches);
	$product_offset = $matches[1];
	$map[$value['post_id']][$product_offset][$value['meta_key']] = $value['meta_value'];
}
print_r($map);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [34] => Array ( [product_shops_0] => Array ( [product_shops_0_price] => 25 [product_shops_0_price_old] => 45 ) [product_shops_1] => Array ( [product_shops_1_price] => 25 [product_shops_1_price_old] => 45 ) ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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